FreeDATA/tools/custom_mode_tests/create_custom_ofdm_mod.py

"""

FreeDATA % python3.11 tools/custom_mode_tests/create_custom_ofdm_mod.py | ./freedata-server/lib/codec2/build_osx/src/freedv_data_raw_rx --vv --framesperburst 1 DATAC1 - /dev/null


"""
import sys
sys.path.append('freedata-server')
import numpy as np

modem_path = '/../../freedata-server'
if modem_path not in sys.path:
    sys.path.append(modem_path)



#import freedata-server.codec2 as codec2
from codec2 import *
import threading
import modulator as modulator
import demodulator as demodulator
import config as config


def demod(txbuffer):
    c2instance = open_instance(FREEDV_MODE.datac3.value)

    # get bytes per frame
    bytes_per_frame = int(
        api.freedv_get_bits_per_modem_frame(c2instance) / 8
    )
    # create byte out buffer
    bytes_out = ctypes.create_string_buffer(bytes_per_frame)

    # set initial frames per burst
    api.freedv_set_frames_per_burst(c2instance, 1)

    # init audio buffer
    audiobuffer = audio_buffer(len(txbuffer))


    # get initial nin
    nin = api.freedv_nin(c2instance)
    audiobuffer.push(txbuffer)
    threading.Event().wait(0.01)


    while audiobuffer.nbuffer >= nin:
        # demodulate audio
        nbytes = api.freedv_rawdatarx(
            freedv, bytes_out, audiobuffer.buffer.ctypes
        )
        # get current freedata-server states and write to list
        # 1 trial
        # 2 sync
        # 3 trial sync
        # 6 decoded
        # 10 error decoding == NACK
        rx_status = api.freedv_get_rx_status(freedv)
        print(rx_status)

        # decrement codec traffic counter for making state smoother

        audiobuffer.pop(nin)
        nin = api.freedv_nin(freedv)
        if nbytes == bytes_per_frame:
            print("DECODED!!!!")
    print("ENDED")
    print(nin)
    print(audiobuffer.nbuffer)

config = config.CONFIG('config.ini')
modulator = modulator.Modulator(config.read())
#freedv = open_instance(FREEDV_MODE.data_ofdm_2438.value)
#freedv = open_instance(FREEDV_MODE.datac14.value)
#freedv = open_instance(FREEDV_MODE.datac1.value)
freedv = open_instance(FREEDV_MODE.datac3.value)
#freedv = open_instance(FREEDV_MODE.data_ofdm_500.value)
#freedv = open_instance(FREEDV_MODE.qam16c2.value)


frames = 2
txbuffer = bytearray()

for frame in range(0,frames):
    #txbuffer = modulator.transmit_add_silence(txbuffer, 1000)
    txbuffer = modulator.transmit_add_preamble(txbuffer, freedv)
    txbuffer = modulator.transmit_create_frame(txbuffer, freedv, b'123')
    txbuffer = modulator.transmit_add_postamble(txbuffer, freedv)
    txbuffer = modulator.transmit_add_silence(txbuffer, 1000)

#sys.stdout.buffer.flush()
#sys.stdout.buffer.write(txbuffer)
#sys.stdout.buffer.flush()
demod(txbuffer)